Alloy



Patented Oct. 3, 1944 ALLOY Jacob Trantin, Jr., Youngstown, Ohio No Drawing.

Application November 1, 1943,

Serial No. 508,641

18 Claims.

This invention relates to a steel alloy and more particularly to an alloy particularly adaptable for the formation of guide shoes for seamless tube mills and rolling mills.

The principal object of the invention is the provision of a steel alloy particularly adapted for the formation of guide shoes for seamless .tube mills and plugs for rolling mills, which alloy possesses the desirable characteristics of freedom from scratching and lack of scale pick-up.

A further object of the invention is the provision of a steel alloy from which guide shoes and rolling mill plugs and similar articles may be cast, all of which articles can be successfully used over a considerably longer period of time than articles cast of other alloys heretoforeknown in the art. e

A still further object of the invention is the provision of an alloy from which guide shoes for rolling mill plugs and similar'articles may be cast, the characteristics of which articles may be improved by heat treatment so as to particularly adapt the articles for their purposes.

With the foregoing and other objects in view which will proceed as the description appears, the invention resides in an alloy capable of being cast into guide shoes and rolling mill plugs and similar articles, which articles possess unusually longlife as compared with similar articles cast from alloys heretofore known in the art, it being understood that the alloy may be varied from the analysis herein disclosed within the scope of what is claimed without departing from the spirit of the invention.

The improved alloy, the subject of this invention, is useful wherever the characteristics of freedom from scratch and lack of scale pick-up are of utmost importance, as for example, guide shoes for seamless tube mills and plugs for rolling achieved by the composition of an alloy including about 1.10 to 1.50% carbon, 'about 13.50% to 18.00% chromium, about 1.50%. to about 3.50% cobalt, about 50% to about 1.50% copper, molybdenum in percentages up to about 3%, manganese about .50% to about 1.25% and silicon about to about 1.25%, and the remainder substantially all iron, the silicon and manganese being common in similar alloys, and including the usual percentages of sulphur and phosphorus which in themselves are not objectionable.

It will thus be seen that the various objects of my invention may be accomplished by the use of the ferrous alloy in steel range herein described.

A typical heat of the alloy of my invention possessing the several desirable characteristics of long wear, freedom from scratch and lack of scale pick-up may be seen in the following analysis: carbon 1.37%, chromium 15.82%, cobalt 3.48%, copper 1.09%, molybdenum .86%, [manganese .67% and silicon 54%.

The alloy formed in accordance with the invention is of such nature as to lend itself particularly well to heat treatment for hardening and other purposes and the hardness of the resulting article may be varied by modifying the heat treatment. The guide shoes for seamless tube mills and plugsfor rolling mills which are representative of articles which can be cast of the alloy of my invention are, when heat treated at temperatures in excess of 1400 F., found, in use, to be definitely superior to similar articles cast of alloys heretofore known in the art, particularly with respect to their unusually long life.

Articles formed from the alloy of my invention while superior in their cast state to similar articles cast of alloys heretofore known in the art, may be substantially improved for specific purposes by varying heat treatments considered to come within the scope of this invention. For example, heat treatment of an article formed of the alloy at temperatures between 300 F. and 1600 F. serves to relieve the casting strain thereby improving the article. Subjecting an article formed of the alloy to a thorough annealing at a temperature of 1650 F. or thereabout also substantially improves the article for certain purposes. Articles cast from the alloy may be improved by heating the same to temperatures above 1600 F. and cooling them at a relatively ,rapid cooling rate. Articles cast of the alloy of my invention may be improved by first heating to temperatures above 1600 F. and subsequently reheating the article to temperatures up to 1600 F. By subjecting articles cast of the alloy of my invention to an interrupted quench after first heating the articles up to 1600 F. also will impart desirable characteristics to the articles. For example, after such first heat treatment the article may be cooled to temperatures between 1000" F. and 1400 F. and permitted to soak at that temperature thereby effecting an interrupted quench.

As these various heat treatments vary the characteristics of articles cast from the alloy of my invention, they are considered to come within the scope of the invention. I

Having thus described my invention, what I claim is:

1. An alloy comprising between 1.10% and about 1.50% carbon, between about 13.50% to about 18.00% chromium, between about 1.50% to about 3.50% cobalt, between about .50% to about 1.50% copper, effective amounts up to 3.00% of molybdenum, between about .50% to about 1.25% manganese, and between about .50% to about 1.25% silicon, and the remainder substantially about 18.00% chromium, between about 1.50% to about 3.50% cobalt, between about .50% to about 1.50% copper, effective amounts up to v 3.00% of molybdenum, between about .50% to all iron including the usual percentages of sulphur and phosphorus, said alloy being characterized by an unusual resistance to wear and complete freedom from scale pick-up.

2. An article adapted to guide hot metal during the forming thereof and comprising a cast steel body having an analysis including about 1.37% carbon, about 15.82% chromium, about 3.48% cobalt, about 1.09% copper, about .86% molybdenum, about .67% manganese and about 54% silicon, and the remainder substantially all iron including the usual percentages of sulphur and phosphorus, said article being characterized by an unusual resistance to wear and complete freedom from scale pick-up.

3. An alloy comprising about 1.37% carbon. about 15.82% chromium, about 3.48% cobalt, about 1.09% copper, about .86% molybdenum, about .67% manganese and about 54% silicon, and the remainder substantially all iron including the usual percentages of sulphur and phosphorus, said alloy being characterized by an unusual resistance to wear and complete freedom from scale pick-up.

4. The method of making a guide shoe or rolling mill plug or a similar article which includes casting said article of a ferrous alloy having the following analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to about 18.00% chromium, between about 1.50% to about 3.50% cobalt, between about .50% to about 1.50% copper, efiective amounts up to 3.00% of molybdenum, between about .50% to about 1.25% manganese, and between about .50% to about 1.25% silicon, and the remainder substantially all iron including the usual percentages of sulphur anikphosphorus, and subsequently heat :\treating the article so formed at controlled temperatures in excess of 1400 F. and cooling in accordance with practices known in the art.

5. The method of making a guide shoe or rolling mill plug or a similar article which includes casting .said article of a ferrous alloy haying the following analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to about 18.00% chromium, between about 1.50% to about 3.50% cobalt, between about .50% to about 1.50% copper, effective amounts up to 3.00% of molybdenum, between about .50% to about 1.25% manganese, and between about .50% to about 1.25% silicon, and the remainder substantially all iron including the usual percentages of sulphur and phosphorus.

6. The method of making a guide shoe or rolling mill plug or a similar article which includes about 1.25% manganese, and between about .50% to about 1.25% silicon, and the remainder substantially all iron including the usual percentages of sulphur and phosphorus, and subsequently heating the article as cast for the purpose of relieving casting strain.

7. The method of making a guide shoe or rolling mill plug or a similar article which includes casting said article of a ferrous alloy having the following analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to about 18.00% chromium, between about 1.50% to about 3.50% cobalt, between about .50% to about 1.50% copper, effective amounts up to 3.00% of molybdenum, between about .50% to about 1.25% manganese, and between about .50% to" about 1.25% silicon, and the remainder substantially all iron including the usual percentages of sulphur and phosphorus, and subsequently thoroughly annealing the article at 1650% F. or thereabout.

8. The method of making a guide shoe or rolling mill plug or a similar article which includes casting said article of a ferrous alloy having the following analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to about 18.00%chromium, between about 1.50% to about 3.50% cobalt, between about .50% to about 1.50% copper, effective amounts up to 3.00% of molybdenum, between about .50% to about 1.25% manganese, and between about .50% to about 1.25% silicon, and the remainder substantially all iron including the usual percentages of sulphur and phosphorus, and subsequently heating the article so formed to a temperature in excess of 1600 F. and cooling the article at a relatively rapid rate thereafter.

9. The method of making a guide shoe or rolling mill plug or a similar article which includes casting said article of a ferrous alloy having the following analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to about 18.00% chromium, between about 1.50% to about 3.50% cobalt, between about .50% to about 1.50% copper, effective amounts up to 3.00% of molybdenum, between about .50% to about 1.25% manganese, and between about .50% to about 1.25% silicon, and the remainder substantially all iron including the usual percentages of sulphur and phosphorus, and heat treating the article so formed to a temperature about 1600 F. and subsequently reheating the article to a temperature up to 1600 F.

casting said article of a ferrous alloy having the following analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to 10. The method of making a guide shoe or rolling mill plug or a similar article which includes casting said article of a ferrous alloy having the following analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to about 18.00% .chromium, between about 1.50% to'about 3.50% cobalt, between about .50% to about 1.50% copper, effective amounts up to 3.00% of molybdenum; between about .50% to about 1.25% manganese, and between about .50% to about,1.25% silicon, and the remainder substantially all iron including the usual percentages of sulphur and phosphorus, and heating the article so formed to a temperature in excess of 1600 F. and subsequently subjecting the article to an interrupted quench.

11. An alloy comprising between 1.10% and about 1.50% carbon, between about 13.50% to e about 18.00% chromium, between about 1.50% to about 3.50% cobalt, between about .50% to about. 1.50% copper, between about .50% to about 1.25% manganese, and between about .50% to about 1.25% silicon, and the remainder substantially all iron including the usual percentages of sulphur and phosphorus, said alloy being characterized by an unusual resistance to wear and complete freedom from scale pick-up. I

12 The method of making a guide shoe'or rolling mill plug or a similar article which includes casting said article of a ferrous alloy having the following analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to about 18.00% chromium, between about 1.50% to about 3.50% cobalt, between about .50% to about 1.50% copper, between about .50% to about 1.25% manganese, and betweenabout .50% to about 1.25% silicon, and the remainder substan tially all iron including the usual percentages of sulphur and phosphorus and subsequently heat treating the article so formed. at controlled temperatures in excess of 1400 F. and cooling in accordance with practices known in the art.

13. The method of making a guide shoe or rolling mill plug or a similar article which includes casting said article of a'ferrous alloy having the following analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to about 18.00% chromium, between about 1.50% to about 3.50% cobalt, between about .50% to about 1.50% copper, between about .50% to about 1.25% manganese, and between about .50% to about 1.25% silicon, and the remainder substantially all iron including the usual percentages of sulphur and. Phosphorus.

' 14. The method of making a guide shoe or rolling mill plug or a similar article which includes casting said article of a ferrous alloy having the following analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to about 18.00% chromium, between about 1.50% to about 3.50% cobalt, between about .50% to about 1.50% copper, between about .50% to about 1.25%

manganese, and between about.50% to. about 1.25% silicon, and the remainder substantially all iron including'the usual percentages 'of sulphur and phosphorus, and subsequently heating the article as cast for the purpose of relieving casting strain.

15. The method of making a guide shoe or rolling mill plug or a similar article which includes casting said article of a ferrous alloy having the following analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to ing the article so formed to a temperature in about 18.00% chromium, between about 1.50%

to about 3.50% cobalt, between about .50% to about 1.50% copper, between about'.50%' to about 1.25% manganese, andbetween about .50% to casting said article of a ferrous alloy having the jfollowing analysis: between about 1.10% and about 1.50% carbon, between about 13.50% to about 18.00% chromium, between about 1.50% to about 3.50% cobalt, between about-.50% to about 1.50% copper, between about .50% to about 1.25% manganese, and between about .50% to about 1.25% silicon, and the remainder substantially all iron including the usual percentages of sulphur and phosphorus, and subsequently heatexcess of 1600F. and-cooling the article at a relatively rapid rate thereafter. i a

17. The method of making a guide shoe or rolling mill plug or a similar, article which includes casting said article of a ferrous alloy having the following analysis: between about 1.10% and about 1.50%.carbon, between about 13.50% toabout 1.25% silicon, and the remainder substanto about 3.50% cobalt, between about .50% to tially: all iron including the usual percentages of sulphur and phosphorus, and heat treating the article so formed to a temperature about 1600 F. and subsequently re-heating the article to a temperature up to, 1600 F. I

18. The method of making a guide shoe or roll-- ing mill plug or a similar article which includes casting said article of a ferrous alloy having the followinglanalysis: between about 1.10% and about 1.50% carbon, between about 13.50% to about 18.00% chromium, betweenabout 1.50%

about 1.50% copper, between about .50% to about 1.25%, manganese, and between about .50% to about 1.25% silicon, and the remainder substantially all iron including the usual percentages of sulphur and phosphorus, and heating the article I so formed to a temperature in excess of '1600 F.

and subsequently subjecting the article to an interrupted quench.

JACOB 'IRANI'IN, JR.

the article at 1650 F. or there! 

